Be faithful in the small jobs that God gives you to do, for they are a teaching ground used to prepare you for bigger projects.
Sometimes it may seem like the tasks we are asked to do are not very significant or important. They may be things which we don't like doing. But each task we are asked to do has a purpose. Each job, done with the right attitude, can be used to bring a change, teach us a skill or give us new insight. It can be used to develop character traits, like endurance, patience, honesty and faith.
When I think about being faithful in the small things, I am reminded of many stories, including the story of Joseph, who being sold as a slave, worked for his Egyptian master. It could seem that the jobs he was asked to do as a slave were not very important, yet, because he was faithful to God and in doing his tasks, God was with him and "he succeeded in everything he did as he served in the home of his Egyptian master." (Gen 39:2, NLT).
You can read Joseph's story from working as a slave to being second in command after the Pharaoh. The story is found in the Bible, in the book of Genesis, starting in chapter 39.